Main-rod brass.



P. A. EIGHORN. MAIN ROD BRASS.

APPLICATION TILED JAN. 6, 1913. 1.1 1 8.749. Patented Nov. 24, 1914..

WITNESSES INVENTOR Fmder-ick Aficbprr;

ATTORNEYS FREDERICK A. EICHORN, OF CHATTANOOGA, TENNESSEE.

MAIN-ROD BRASS.

Specification of Letters Iatent.

Application filed January 6, 1913.

To all whom it may concern Be it known that I, FREDERICK A. EICHORN, a citizen of the United States, and a resident of Chattanooga, in the county of Hamilton and State of Tennessee, have in vented a new and Improved Main-Rod Brass, of which the following is a full, clear, and exact description.

isually, at present, the brass of the main rod of locomotives has associated with the brass and the key or wedge, a separate liner against which the key bears, and which liner in turn bears against the brass in exerting a thrust in the direction of the crank pin in adjusting the brasses to the pin. Under conditions of the present practice, also, the brasses are very liable to breakage across the line of least thickness, owing to the binding, and locking of the brass at top and bottom on the pin, due to expansion of the brass. Breakage is due also to the knocking of the pin against the brasses when the locomotive is drifting.

My invention has for its design to produce mainaod brasses of a form making unnecessary the use of the separate liners usually employed; to provide a brass having a steel keyengaging liner embedded therein and essentially integral therewith, so formed and disposed in the brass as to give the latter increased strength; to provide a form of mainrod brass having an increased amount of bearing metal and of a proportionately increased period of'iisefulness under wear; to provide a strengthening liner that will hold the parts of the brass in position should the brass become broken; and to provide a form of brasses having strengthening liners so formed and disposed therein as to make the mating brasses reversible and interchangeable.

The invention will be particularly explained'in the specific description hereinafter to be given.

Reference is to be had to the accompanying drawings forming a part of this spcci= fication, in which similar charactersof reference indicate corresponding parts in both views.

Figure 1 is a longitudinal vertical section showing my improved brasses applied to a connecting rod and crank pin; and Fi 2 is a perspective view of my improved liner before being cast into a brass.

The connecting rod 10 is of the ordinary Patented N 0v. 24, 1914.

Serial N0. 740,394.

form, having its strap 11 secured by bolts 12 and iii. The brassesflxl are received as usual within the strap 11, to embrace the crank pin 15, under the thrustof a key or wedge 16. Each brass, or at-least that brass at the inner side of the crank pin, has e1nbedded therein a liner 17, preferably formed at the upper and lower ends thereof with lateral flanges 18 for strength, and to give better inter-engagement with the bearing material of the brass. The flanges 18 are preferably undercut, as shown, to give a dovetail engagement with the brass.

At the back of the liner a vertical strengthening rib 19 is produced, and preferably also a transverse strengthening rib 20. In casting the liner in the bearing matorial of the brass the said material is caused to overlap as at 21 the upper and lower ends of the liner 17, which is beveled at the outer surfaces of the said upper and lower ends, as at 17, whereby the material of the brass will have a similar beveled formation Over the exterior of the liner, and the latter will thus be in effect dovetailed in, and a firm interlock be thus established between the liner and the body of the brass. The side edges 17" may also be beveled as shown.

To hold the brass against the crank pin 15, and to take up wear as it occurs, I prefer to form the wedge or key 16 with a front surface 16 perpendicular to the direction of thrust and the back edge 16" of beveled or wedge form, the opposed surfaces 11 on the strap having a similar bevel, or incline to give the necessary wedge action.

The back surface of the liner 17 as presented by the ribs 19, 20, is flush with the back of the brass. or projects therefrom sufficiently to constitute a bearing surface for the key or other wedging device.

It will be seen that the liner extends verticall y across the waist or line of least thickness of the brass and therefore gives increased strength to the brass at this point, in order to resist the blows resulting from the drifting of the engine, and the unitary character of the brass and its liner saves time and expense not only in the adjustment of the parts of the device, but in its imumfacturc; moreover, a greater amount of bearing material may be incorporated in the brass by my improved construction, thereby prolonging its life, andeven should breakage occur, the broken parts will be held measurably closeendbe prevented from such displacement as to cause a locked binding engagement with the crank pin.

Holes 22 are formed in the liner to receive dowels ,tu hold the liner While the brass is being poured.

Having thus described my invention, I claim es new, and desire to secure by Letters Patent:

In a brass for main rods and the like, an embedded steel liner cast therein, at the back, and extending continuously aeress the transverse line of least thickness of the bearing metal, said liner having external strengthening ribs extending vertically and transversely, the ribs crosslng at the line of least thickness of the bearing metal, and constituting a bearing surface for receiving @cpiet 0:? this patent they be obtetnerl tor the thrust of e locking device, the upper and lower edges of the liner being beveled at the outer sides thereof, and the bearing metal being cast over the said metal surfaces overhanging at the outer side thereof, forming a dovetail interlock, the liner being furthermore formed on the inner face with upper and lower under cut ribs with which the rnnnnnrcn A. nrcnonn.

Witnesses H. M. GHORMLEY,

J, C. GRrrrnN. v

five cents each, by eddressiug the Commissioner oi Patents.

Weehtnfgten, 3, Q3. 

